USDA zone 6b and warmer. Spring Pruning: Remove old canes and dead or diseased wood and cut back canes that cross. In warmer climates, cut back the remaining canes by about one-third. In colder areas, you'll probably find you'll have to prune a little more than that.

Ellen Willmott (August 19, 1858 - September 27, 1934), English horticulturalist, who cultivated more than 100,000 species of plants in her garden Warley Place. She published "The Genus Rosa" in 1910-14.
[Note: there is also a light pink 'Ellen Willmott' (Bernaix 1898). It is double, having about 20 petals.]